DEVICE FOR PNEUMATIC PRODUCTION OF HYDROMECANICALLY TRANSPORTED CONCRETE IN DENSE CURRENT

摘要

The invention relates to a device for pneumatically discharging concrete (2) transported hydromechanically in compact flow, comprising a concrete pump (2) for the hydromechanical transport and a solidification-accelerating-agent proportioning unit. In order to provide a device with which a plurality of additives can be added simultaneously in a proportioned manner, which in each case can be adjusted from a minimum to a maximum value, provision is made for at least one further additive proportioning unit (500, 501, 502) having a linear piston pump (470, 471, 472) to be provided which is likewise connected to the linear piston drive (34-37) of the device, in which arrangement a directional control valve (490, 491, 492) for changing the direction of the proportioning agent into in each case a proportioning-agent tank (460, 461, 462) or into the proportioning-agent transport line (8, 81, 82) is fitted in the transport line (480, 481, 482) of each further proportioning unit (500, 501, 502), the directional control valves (490, 491, 492) being acted upon by the hydraulic medium pressure prevailing in the piston space of the working cylinders (25, 26). IMAGE